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scheduled task
Resin's <resin:ScheduledTask> capability lets you schedule
events using a flexible cron-style trigger. The task can be
any <resin:ScheduledTask> schedules a job to be executed at specific times
or after specific delays. The times can be specified by a cron syntax or
by a simple delay parameter. The job can be either a When specified as an Java Injection bean, the bean task has full IoC capabilities, including injection, @TransactionAttribute aspects, interception and @Observes.
Java Injection bean job configurationThe most common and flexible job configuration uses standard IoC
bean-style configuration. The bean must implement Example: 5min cron bean task
<web-app xmlns="http://caucho.com/ns/resin"
xmlns:resin="urn:java:com.caucho.resin">
<resin:ScheduledTask>
<cron>*/5</cron>
<qa:MyTask xmlns:qa="urn:java:com.caucho.resin"/>
</ScheduledTask>
</web-app>
task reference job configurationThe task bean can also be passed to the <scheduled-task> using
a Resin-IoC EL reference. The name of the task bean would be defined
previously, either in a <bean> or <component> or picked up by classpath
scanning. Like the bean-style job configuration, the reference bean must
implement Example: midnight cron bean task
<web-app xmlns="http://caucho.com/ns/resin"
xmlns:resin="urn:java:com.caucho.resin">
<resin:ScheduledTask task="#{taskBean}">
<cron>0 0 *</cron>
</resin:ScheduledTask>
</web-app>
method reference job configuration<scheduled-task> can execute a method on a defined bean as the scheduler's task. The method is specified using EL reference syntax. At each trigger time, <scheduled-task> will invoke the EL method expression. In the following example, the task invokes Example: 1h period method task
<web-app xmlns="http://caucho.com/ns/resin"
xmlns:resin="urn:java:com.caucho.resin"
xmlns:qa="urn:java:qa">
<qa:MyBean>
<Named>myBean</Named>
</qa:MyBean>
<resin:ScheduledTask method="#{myBean.myMethod}">
<resin:delay>10m</resin:delay>
<resin:period>1h</resin:period>
</resin:ScheduledTask>
</web-app>
url job configurationIn a <web-app>, the <scheduled-task> can invoke a servlet URL
at the trigger times. The task uses the servlet Example: sunday cron url task
<web-app xmlns="http://caucho.com/ns/resin"
xmlns:resin="urn:java:com.caucho.config">
<resin:ScheduledTask url="/cron.php">
<resin:cron>0 15 * * 0</resin:cron>
</resin:ScheduledTask>
</web-app>
cron trigger syntaxSome ascii art from the wikipedia cron entry cron fields # +---------------- minute (0 - 59) # | +------------- hour (0 - 23) # | | +---------- day of month (1 - 31) # | | | +------- month (1 - 12) # | | | | +---- day of week (0 - 6) (Sunday=0 or 7) # | | | | | * * * * *
Each field specifies a range of times to be executed. The patterns allowed are:
The minutes field is always required, and the hours, days, and months fields are optional.
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